Carton



R. GUYER Jan. 12, 1954 CARTON Filed May 19, 1948 particularly adjacent these ribs.

atented Jan. 12, 1954 I 'UNITED STATES I CARTON Reynolds Guyer, St. Paul, Minn., assignor to Waldorf Paper Products Company, St. Paul, Minn., a corporation of Minnesota Y Application May 19, 1948, Serial No. 27,843V

s claims. 01. ace-sv)V A My invention relates to an.. improvement in 'carton wherein it is desired to form a carton -Which will not sift when containing powdered or granular'material.

One of the biggest objections to the use of tubular cartons forcontaining powdered or granularmaterial lies in the tendency for such car- Atons to sift at the corners. To some extent this sifting is caused by the openings formed when the closingaps of the carton are folded into superimposed relation. When the cartons are lformed they are provided with crease lines or score lineswhich are in reality small channels formed in one surface of the carton stock which produce projecting beads on the other surface of the paper board. These projecting ribs or beads tend to prevent the outermost flaps from folding at against the surface of the inner flaps Thus powdery materialV is often permitted to escape through the narrow unglued area closely adjacent they score lines.

The object of the present invention lies in .the provision of closing flaps having cut away edge portions designed to accommodate the beads or These and other objects and novel features or my invention will be more clearly and fully set forth inthe following specification and claims;

ribs formed at thescore lines connecting the outermost flaps to the carton. As a result when thecar'ton is sealed the bead produced adjacent the outer -score lines fills the cut away portion andproduces a tighter carton.

A feature of the present invention lies in the provision of cut away portions which extend the majoriportion of the length of the beads which they accommodate but the cutaway portions ter- .minate short Yof the extremities of the flaps. As

a result small tips or ears are produced which extend into the carton corners to assist 1n closing the same. These ears are of sufficiently small vsize so that they will readily distort in the'ilap closing operation.

A feature of the present invention lies in the formation of a carton of usual tubular construction having end closure flaps on the wall panels of at least one end thereof. Two of these flaps are designed to fold into superimposed relation, forming the innermost flaps of the series and these inner flaps are preferably co-extensive. The remaining opposed flaps are designed to fold into coplanar relationship outwardly of the two larger aps, thus reversing the usual sequence of fold. The edges of the inner two flaps parallel to the fold lines connecting the remaining two opposed flaps to the carton are notched throughout most of their length so as to produce a space for accommodating the inwardly bulging carton stock produced by the inward folding of the remaining apS- t In the drawings forming a part of my specificaion:

Figure l is a diagrammatic View of a carton blank showing my construction. Figure 2 is a perspective View of the carton shownin Figure l in partially folded position,l

Figure 3 is a perspective View of the carton end in completely folded condition. Figure .4 is an enlarged sectional view showing the manner in which the carton stock fills the gap or notch formed in the ends of the inner- 4most flaps.

The carton A is Ain general similar to an ordinary tubular carton. The side wall I 0, front wallv II, side wall I2, and rear wall I3 are foldably connected together along parallel fold lines I4, I5, and I6.. A glue-flap I'I is foldably connected to the wall panel I3 along a fold line I9. The terms frontf and rear wall panels are employed merely for ease in explanation as any of the panels can form the front or rear of the carton. 1 Y Furthermore, as both of the ends of the carton Aare shown identical in structure, the ilapsat opposite ends-0f thecarton will be given similar identifying numerals. y

Closing flaps' 201ar'e foldably connected to the top'and bottom ends of the front wall panel II along parallel fold lines 2| Similar closing flaps 22 are foldably connected to the upper vand lower extremities ofl the rear panel I3.Y Closing flaps 23 are foldably connected to the upper and lower edges of the sidewall panel I0 and similar flaps 24` are vfoldably'connected to the upper ends of "the side wall panel I2. The flaps 23 and 24 may be" rectangular in shape if desired but are shown as being vof tapered form to simplify the stripping of the carton stock from the notched or recessed edges of the flaps 20 and 22.

The opposite ends of the flaps 20 are provided with elongated notches or cut away portions which extend virtually the entire length of the flaps. The notches 25 at opposite ends of the flaps 2o angle inwardly from the juncture of the fold lines 2| with the vertical fold lines I4 and I5, extend parallel throughout most of the length of the flaps 20 and angle outwardly or in a diverging direction near the extremities of these flaps. This arrangement forms small pointed ears or tips 26 at the extremities of the flaps and similar ears 21 at the juncture between the flaps 20 and the fold lines 2I.

The flaps 22 are similarly provided with elonwhich they hinge.

gated cut away portions or notches 29 which angle inwardly from the juncture between the fold lines 2| and the vertical fold lines I6 and I9 to form ears 30. Near their outer extremity the notches or cut away portions 29 angle out- Wardly in a diverging direction to form small ears or tips 3|.`

As a result of this structure the closing flaps and 22 are somewhat narrower than the distance between the side wall panels I0 and l2 when the carton is rectangularly arranged. The depth of the notches and 29 is approximately equal to the thickness of the bulge or ribformed on the inner surface of the carton stock during the creasing operation. As a result the folding downwardly of the flaps 23 and 24 does not cause the ridge or bead on the inner surface of the stock to rest upon the upper surface of the inner flaps.

As is well Aknown in the box making art, score lines are usually produced by means vof a scoring rule which forces, thecarton stock into a corresponding channel formed in the female Aportion of the die. This produces a visible rib or ridge y.which is noticeable when the carton is in at condition. In folding the carton, it is usual practice tofold the paper with this ridge innermost.

As a result the outside of the carton stock forms a generally right angular corner While the inner surface of the paper board forms a very pro- It is usual practice to separate the closing flaps by use of a cutting rule which forms a cut or slit of no visible width. As a result the carton flaps are of the same width as the panels from When the flaps are folded into superimposed relation the internal ribs or ridges in the carton stock at the fold lines tend to hold the flat surfaces apart for a short distance from thefold lines. If the flaps are made narroWer the carton stock between the flaps must be 'stripped away and an aperture is often left at the corners where the beads at the fold lines are compressed, thus creating a tendency for apertures to be formed at the carton corners. However, I lhave found that by vnotching the ends of the innermost flaps in the manner illustrated and 'leaving the flaps the full width at their extremities the beads formed by folding the outermost naps will ll the space created by the notches and will crowd the small pointed ears at the ends of Athe notches so as to prevent tiny apertures at d pressure is applied to the extremities of side wall panels I0 and I2 near the fold lines 2| when the adjacent flaps 23 and 24 are folded into coplanar relation. This pressure is preferably maintained until the adhesive has set suiciently to hold these aps in adhered position.

In accordance with the patent statutes, I have described the principles of construction and operation of my carton, and while I have endeavcred to set forth the best embodiment thereof, I 4 desire to have it understood that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim:

1. A carton including rectangularly arranged side walls and an end closure, the end closure including closing aps issuing from each of the rectangularly arranged side walls, two of said closing aps `being of substantially the fulldimensions of the end closure and being secured in surface contact, side edges upon said rst named closing flaps extending adjacent ,to the lines of fold connecting the remaining two closing flaps with their respective side walls. said side edges being notched inwardly from the fold lines connecting these rst named flaps to their respective side walls to the free opposite edges of these iirst closing naps, the ends of the notches being inclined to provide 'small pointed ears at cach end thereof, the notched portions extending in parallel relation, inwardly' projecting beads extending along the fold lines connecting said remaining closing flaps Vto their respective end walls, said beads engaging in said notches, said remaining closing aps overlying the first named closing flaps and being secured thereto.

2. The structure described in claim 1 and in which the remaining closing flaps engage the uppermost of the rst named closing aps and are arranged in co-planar relation.

3. The structure described in claim 1 and in which the portions of said side edges beyond said notches extend into the interior corners of the carton. A v

REYNOLDS GUYER.

References Cited in the file Of this 'patent UNITED STATES PATENTS Number Name lDate 2,358,124 Zinn, Jr. a Sept. 12, 1944 2,412,031 Bergstein Dec. 3, 1946 2,530,787 Sanford Nov. 21, 195

FOREIGN PATENTS Number Country Date 1 381,712 Great Britain Oct. 13, 1932 

